Huang Yu-Ching, Tsao Cheng-Si, Cho Yi-Ju, Chen Kuan-Chen, Chiang Kai-Ming, Hsiao Sheng-Yi, Chen Chang-Wen, Su Chun-Jen, Jeng U-Ser, Lin Hao-Wu
Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan.
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
Sci Rep. 2015 Sep 4;5:13657. doi: 10.1038/srep13657.
The structural characterization correlated to the processing control of hierarchical structure of planar heterojunction perovskite layer is still incomplete due to the limitations of conventional microscopy and X-ray diffraction. This present study performed the simultaneously grazing-incidence small-angle scattering and wide-angle scattering (GISAXS/GIWAXS) techniques to quantitatively probe the hierarchical structure of the planar heterojunction perovskite solar cells. The result is complementary to the currently microscopic study. Correlation between the crystallization behavior, crystal orientation, nano- and meso-scale internal structure and surface morphology of perovskite film as functions of various processing control parameters is reported for the first time. The structural transition from the fractal pore network to the surface fractal can be tuned by the chloride percentage. The GISAXS/GIWAXS measurement provides the comprehensive understanding of concurrent evolution of the film morphology and crystallization correlated to the high performance. The result can provide the insight into formation mechanism and rational synthesis design.
由于传统显微镜和X射线衍射的局限性,与平面异质结钙钛矿层分级结构的加工控制相关的结构表征仍不完整。本研究采用同时掠入射小角散射和广角散射(GISAXS/GIWAXS)技术来定量探测平面异质结钙钛矿太阳能电池的分级结构。该结果对当前的微观研究具有补充作用。首次报道了作为各种加工控制参数函数的钙钛矿薄膜的结晶行为、晶体取向、纳米和介观尺度内部结构以及表面形态之间的相关性。分形孔隙网络到表面分形的结构转变可以通过氯化物百分比来调节。GISAXS/GIWAXS测量提供了对与高性能相关的薄膜形态和结晶同时演变的全面理解。该结果可为形成机理和合理的合成设计提供见解。